Support for Nunchuk animated multisig wallet descriptors

src/seedsigner/helpers/ur2/ur_decoder.py

@@ -143,6 +143,10 @@ class URDecoder:
 
     def expected_part_count(self):
         return self.fountain_decoder.expected_part_count()
+    
+    @property
+    def total_segments(self):
+        return self.expected_part_count()
 
     def received_part_indexes(self):
         return self.fountain_decoder.received_part_indexes

src/seedsigner/models/decode_qr.py

@@ -278,7 +278,8 @@ class DecodeQR:
         if self.qr_type in [QRType.BYTES__UR]:
             cbor = self.decoder.result_message().cbor
             raw = Bytes.from_cbor(cbor).data
-            check = 'multisig setup file' in raw.decode("utf-8").lower()
+            data = raw.decode("utf-8").lower()
+            check = 'policy:' in data and "format:" in data and "derivation:" in data
         
         return check
 
@@ -572,7 +573,7 @@ class DecodeQR:
             descriptor += ',[' + x['xfp'] + derivation + "]" + x['key'] + "/{0,1}/*"
         
         descriptor += script_close
-        
+
         return descriptor
 
 class BaseQrDecoder:

src/seedsigner/views/scan_views.py

@@ -79,6 +79,7 @@ class ScanView(View):
 
                 if not descriptor.is_basic_multisig:
                     # TODO: Handle single-sig descriptors?
+                    print(f"Received single sig descriptor: {descriptor}")
                     return Destination(NotYetImplementedView)
 
                 self.controller.multisig_wallet_descriptor = descriptor